How Hot Should My Ignition Coil Get

Ok tomorrow I am going to run it back from the ballast resistor to the ignition coil. Another question I have is I have a push button start. I have a switch for power then turn on with push button. Question do I just run it one side of the ballast with 12v and then on the other end of the ballast connect to the + side of the ignition coil? is that were I am getting the power to the ignition coil?